When starting the engine of a truck with a trailer, how can you tell if the Anti-Lock Braking System (ABS) is not working?

Question

Trailers equipped with Anti-Lock Braking Systems (ABS) are equipped on the left rear with a yellow malfunction lamp. If the malfunction lamp stays on after the engine has been started, the ABS is malfunctioning.

Accepted Answer

The yellow light on the rear of the trailer will stay on.

Answer

The red light on the trailer will flash three times and then stay on.

Answer

All the rear lights on the trailer will flash and then shut off.

Answer

The blue light near the driver's door will light.